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Summary of Significant Accounting Policies (Details)
12 Months Ended
Apr. 30, 2017
USD ($)
plan
Apr. 30, 2016
USD ($)
Apr. 30, 2015
USD ($)
Summary Of Significant Accounting Policies [Line Items]      
Effective Income Tax Rate Reconciliation, Share-based Compensation, Excess Tax Benefit, Amount $ 1,300,000    
Advertising costs 41,000,000 $ 38,100,000 $ 34,300,000
Cash equivalents 50,100,000 34,000,000  
Impairment of long-lived assets $ 0 0 0
Number of defined benefit pension plans | plan 2    
Cash flows from operating activities $ 77,080,000 74,604,000 60,164,000
Cash flows from financing activities $ (20,821,000) (8,909,000) 10,283,000
ASU 2016-09, Statutory Tax Withholding Component [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Cash flows from operating activities   2,800,000 1,400,000
Cash flows from financing activities   (2,800,000) (1,400,000)
Buildings And Improvements [Member] | Minimum [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Property, plant and equipment useful lives 15 years    
Buildings And Improvements [Member] | Maximum [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Property, plant and equipment useful lives 30 years    
Machinery And Equipment [Member] | Minimum [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Property, plant and equipment useful lives 3 years    
Machinery And Equipment [Member] | Maximum [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Property, plant and equipment useful lives 10 years    
Promotional Display [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Amortization $ 3,400,000 3,400,000 $ 3,600,000
Promotional Display [Member] | Minimum [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Property, plant and equipment useful lives 30 months    
Promotional Display [Member] | Maximum [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Property, plant and equipment useful lives 36 months    
Long-term Debt [Member] | ASU 2015-03 [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Debt issuance costs   (300,000)  
Other Noncurrent Assets [Member] | ASU 2015-03 [Member]      
Summary Of Significant Accounting Policies [Line Items]      
Debt issuance costs   $ (300,000)